{
    //rdbms:server type, postgresql 
    "rdbms":"postgresql",
    //host:server address,localhost by default;
    "host":"127.0.0.1",
    //port:server port, 5432 by default;
    "port":5432,
    //dbname:Database name;
    "dbname":"postgres",
    "user":"postgres",
    "passwd":"",
    //"tables":["group_users"]
    "tables":["users"]
}
